linux-kernel - Re: [PATCHv4 38/39] thp: vma_adjust_trans

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Date:	Thu, 23 May 2013 19:01:04 +0800
From:	Hillf Danton <dhillf@...il.com>
To:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Cc:	Andrea Arcangeli <aarcange@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	Hugh Dickins <hughd@...gle.com>,
	Wu Fengguang <fengguang.wu@...el.com>, Jan Kara <jack@...e.cz>,
	Mel Gorman <mgorman@...e.de>, linux-mm@...ck.org,
	Andi Kleen <ak@...ux.intel.com>,
	Matthew Wilcox <matthew.r.wilcox@...el.com>,
	"Kirill A. Shutemov" <kirill@...temov.name>,
	Dave Hansen <dave@...1.net>, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCHv4 38/39] thp: vma_adjust_trans_huge(): adjust file-backed
 VMA too

On Sun, May 12, 2013 at 9:23 AM, Kirill A. Shutemov
<kirill.shutemov@...ux.intel.com> wrote:
> From: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
>
> Since we're going to have huge pages in page cache, we need to call
> adjust file-backed VMA, which potentially can contain huge pages.
>
> For now we call it for all VMAs.
>
> Probably later we will need to introduce a flag to indicate that the VMA
> has huge pages.
>
> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
> ---

Acked-by: Hillf Danton <dhillf@...il.com>

>  include/linux/huge_mm.h |   11 +----------
>  mm/huge_memory.c        |    2 +-
>  2 files changed, 2 insertions(+), 11 deletions(-)
>
> diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h
> index b20334a..f4d6626 100644
> --- a/include/linux/huge_mm.h
> +++ b/include/linux/huge_mm.h
> @@ -139,7 +139,7 @@ extern void split_huge_page_pmd_mm(struct mm_struct *mm, unsigned long address,
>  #endif
>  extern int hugepage_madvise(struct vm_area_struct *vma,
>                             unsigned long *vm_flags, int advice);
> -extern void __vma_adjust_trans_huge(struct vm_area_struct *vma,
> +extern void vma_adjust_trans_huge(struct vm_area_struct *vma,
>                                     unsigned long start,
>                                     unsigned long end,
>                                     long adjust_next);
> @@ -155,15 +155,6 @@ static inline int pmd_trans_huge_lock(pmd_t *pmd,
>         else
>                 return 0;
>  }
> -static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
> -                                        unsigned long start,
> -                                        unsigned long end,
> -                                        long adjust_next)
> -{
> -       if (!vma->anon_vma || vma->vm_ops)
> -               return;
> -       __vma_adjust_trans_huge(vma, start, end, adjust_next);
> -}
>  static inline int hpage_nr_pages(struct page *page)
>  {
>         if (unlikely(PageTransHuge(page)))
> diff --git a/mm/huge_memory.c b/mm/huge_memory.c
> index d7c9df5..9c3815b 100644
> --- a/mm/huge_memory.c
> +++ b/mm/huge_memory.c
> @@ -2783,7 +2783,7 @@ static void split_huge_page_address(struct mm_struct *mm,
>         split_huge_page_pmd_mm(mm, address, pmd);
>  }
>
> -void __vma_adjust_trans_huge(struct vm_area_struct *vma,
> +void vma_adjust_trans_huge(struct vm_area_struct *vma,
>                              unsigned long start,
>                              unsigned long end,
>                              long adjust_next)
> --
> 1.7.10.4
>
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